I am getting this  intermittant chirpping , ecpecially when cold. At first I thought it was wheel bearings in the rear. Then I figured it was my new (10 hours to replace) water pump  about to go south. Finally I snuck up on this noise this morning and discovered not a nest  of little birds, but a bird like sound coming from the rear of the alt.  There is this  bird like chirping coming from the rear of the altenator though. The voltage at my new auxillery battery is 13.25 V. I think it is suposed ot be about 13.5 , or 14 volts. Could this be the end for the brushes? I see that the voltage regulater is ez to remove. Can this be done with the altenator still installed?I see that vendors sell new brushes forabout $3. the Bentley says that these can be resoldered on. Is this a good way to go?

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